Allergic rhinitis is one of the most common diseases and currently affects not less than 15–20% of the general population, with prevalence steadily increasing both in children and adults. It is often considered of negligible medical importance, but a number of aspects oppose this perception, including the relevant economic impact and the significant impairment of the patient’s quality of life. This book provides practitioners with the information to appropriately manage this common and underestimated disease. The five chapters provide a broad overview of our current understanding of allergic rhinitis, including clinical presentation, pathogenesis, diagnosis and treatment.